Belcher killed his girlfriend, Kasandra Perkins, with nine gunshots, orphaning their 3-month-old daughter. He then drove to the Chiefs’ practice facility and killed himself in front of his coach and GM.

But sources tell the Post that Belcher was out much later and wasn’t even home to note his baby-mama’s arrival time.

They say he went to dinner with Glass “at a local tavern,” had a bunch of drinks, took her home and passed out in his Bentley in front of her house. When cops woke him up he went into Glass’ place and spent the night there. Glass wouldn’t say which room he slept in. She says they weren’t in a relationship, but neighbors say they’ve seen his car at her house several times.